Process for the removal from cast iron the oxides introduced therein and other foreign inclusions



Patented Dec. 29, 1942 PROCESS FOR THE REMOVAL FROM CAST IRON THE OXIDESINTRODUCED THERE- IN AND OTHER FOREIGN INCLUSIONS Nicholas L. Peder-sen,Clifton, N. J.

No Drawing. Application March 23, 1942, Serial No. 435,832

lClaim.

This invention relates to the process of removing the oxides and otherforeign inclusions introduced into cast iron in its various forms knownas gray iron, semi-steel and alloyed cast iron in one single treatmentby means of adding a distinct chemical known as sodium silico fluorideto the molten metal as a ladle scavenger or flux, or added to the streamof hot iron in the spout as it leaves the cupola and has for its objectthe purpose of furnishing to the trade a. superior casting product at aprice at par with that charged for the product now cast from theuntreated metal.

I have found that sodium silico fluoride when added to the molten ironin amounts up to five reduction in rejects due to such defects as blowholes, sponge and slag, the casting product can pounds for every 2000pounds of iron to be treatt ed will result in a cast iron more free ofblow be manufactured and sold at a price at par with castings made fromthe ordinary run of untreated metal.

I claim:

The process of removing from cast iron the oxides introduced therein andother foreign inclusions by adding sodium silico fluoride to the moltencast iron.

NICHOLAS L. PEDERSEN.

